Summary for zinc-nickel alloy bath Discussion
The zinc-nickel alloy bath question centers on how to get nickel to co-deposit with zinc in the desired ratio when using diethyletryemine. The answerer explains that nickel is more noble than zinc, so the bath must chelate nickel strongly enough that there are essentially no free nickel ions; otherwise the alloy ratio will not form as intended. He adds that he is not a chemist and cannot confirm whether diethyletryemine is the best chelating agent for nickel. He also notes a practical industry point: in the USA, most plating shops buy proprietary zinc-nickel processes from suppliers instead of mixing them from scratch, because the formulations are usually patented or trade secrets. The exchange therefore points to chelation as the key principle, while stopping short of giving a specific recipe.
Dear Sir,
I Ph,D student my research (Development Zn-Ni base system), I’m working (12-14%Ni) my bath composition ZnO 3.88 g/l, NiSO4.6H20 1.33g/l, NaOH 45 g/l, diethyletryemine 1 ml, My bath 300 cc, anode pure Ni after that replaced by pure Zn, purged Nitrogen pure, I’m using potentiostat -900 mv to -2000 mv using reference electrode Ag/AgCl/KCl, My problem the result test by X-Ray or X-Ray fluorescent 90% Ni,10% Zn this means opposite result.
Rabea
Ph.D researcher – Amman, Jordan
2006
? I’m not sure if I understood the question, Rabea. You were trying to get a deposit with 12-14 percent nickel, but X-Ray testing has proven that the deposit is actually 90 percent nickel? Is that what you’ve said?
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
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Q. Dear Sir,
many thanks for your reply (that is true what I would said), please you didn’t tell me a solution for this problem.
Rabea
Researcher – Amman Jordan
“Electrodeposition of Alloys: Principles & Practice”
by Abner Brenner
on Amazon
or
or
(affil link)
A. Hi
Nickel is more noble than zinc and can only deposit in the ratio you wish if you successfully chelate it so that there are essentially no free nickel ions. I am not a chemist and don’t know if diethyletryemine is the most appropriate chelating agent for the nickel. Here in the USA virtually all plating shops purchase their plating solutions as proprietaries from plating process suppliers, rather than mixing them themselves; these processes are patented or retained as trade secret and very few of us know their actual composition.
Luck & Regards,
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
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